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Theory
The interference phenomenon is the superposition of two (or more) coherent waves. In optics this is causes the apparition of a system of dark and bright fringes.
Because the interference term can be cancelled by the difference of faze, it is necessary that the light of the 2 sources used (S1 and S2) to come from the same source(S). The first to prove that the light produces interferences was Thomas Young. , and his device is the following:
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